Question

This is the basic connection code for a small PHP IRC bot. The problem is that it seems that the while() loop does not progress beyond fgets() until it receives data from the IRC server. I want the while() loop to iterate regardless if the IRC server has not yet sent data. Is this possible?

$socket = fsockopen($config[ irc_server ], $config[ port ]);
while (1) 
{
    $data = fgets($socket, 128);
    echo  [RECEIVE]   . $data;
    $recv = explode(   , $data);

    if ($recv[0] ==  PING )
    {
        send( PONG , $recv[1]);
    }
}

Answer 1

Check out the socket_* functions including this one:

socket_set_nonblock

You can can also pass a non-block flag to socket_recv

Here is the obligatory quick and dirty example (no error checking)

/* Create a TCP/IP socket. */
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$result = socket_connect($socket, $address, $service_port);
while (false === ($bytes = socket_recv($socket, $buf, 2048, MSG_DONTWAIT))) 
{ /* do stuff while waiting for data */ }

Answer 2

Take a look at ftell. Here is a related example from the php documentation:

#!/usr/bin/php4 -q
<?
#following will hang if nothing is piped:
#$sometext = fgets(STDIN, 256)

$tell = ftell(STDIN);

if (is_integer($tell)==true) 
  {echo "Something was piped: ".fread(STDIN,256)."
";}
else 
  {echo "Nothing was piped
";}

?>

Answer 3

stream_select() can tell if data is available for reading on the socket. But fgets() doesn t return until there s a line break or the stream ends. So you d have to use fread() instead and split the data yourself.

btw: You might also be interested in the PEAR::Net_SmartIRC package.

Answer 4

The problem is that it seems that the while() loop does not progress beyond fgets() until it receives data from the IRC server.

I don t see how that s a problem. What do you want that code to do if it receives nothing?

At the moment, it ll just loop around back to the fgets again, so you re just burning cycles busy-waiting for no good reason. Blocking is the correct behaviour in this instance.

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